A hockey player gets hit on the side of his knee with a puck and feels a pop. After rest and icing, he finds that his lower leg feels "loose" and has a tendency to hyperextend. What injury has he likely suffered?
A. A torn transverse ligament
B. A torn posterior tibiofibular ligament
C. A torn anterior cruciate ligament
D. A torn calcaneal (Achilles) tendon
Answer: C
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The structures responsible for distributing excitation to the contractile cells are
A) contractile cells. B) conducting cells. C) intercalated cells. D) pacemaker cells. E) intermodal cells.
The surge in luteinizing hormone that occurs during the middle of the ovarian cycle triggers
A) follicle maturation. B) menstruation. C) ovulation. D) menopause. E) atresia.
The blood vessels at the boundary of the cortex and medulla of the kidney are the
A) cortical radiate artery and vein. B) segmental artery and vein. C) interlobar artery and vein. D) glomerular artery and vein. E) arcuate artery and vein.
Which of the following organs produces bile?
a. liver c. gallbladder b. kidney d. pancreas